Titanium dioxide is the most widely used white pigment because of
its brightness and very high refractive index ( n = 2.7) , in which
it is surpassed only by a few other materials. Approximately 4
million tons of pigmentary TiO2 are consumed annually worldwide.
When deposited as a thin film, its refractive index and colour make
it an excellent reflective optical coating for dielectric mirrors
and some gemstones like " mystic fire topaz " . TiO2 is also an
effective opacifier in powder form, where it is employed as a
pigment to provide whiteness and opacity to products such as
paints, coatings, plastics, papers, inks, foods, medicines ( i.e.
pills and tablets) as well as most toothpastes. In paint, it is
often referred to offhandedly as " the perfect white " , " the
whitest white " , or other similar terms. Opacity is improved by
optimal sizing of the titanium dioxide particles.
titanium dioxide Images